Experimental Study on Dynamic Deformation of Residual Soil under Cyclic Loading

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (11) : 224-231.

YIN Song 1, KONG Ling-wei 1, YANG Ai-Wu2, MU Kun1, WANG Tao2

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Abstract

In order to research the deformation characteristics of compacted residual soil under cyclic loading, dynamic triaxial test on the compacted residual soil of different moisture contents, confining pressures and amplitude conditions was conducted. The hysteresis back curve, development law of cumulative plastic strain and skeleton curve of the soil under different physical and mechanical conditions were obtained. The decay law of dynamic elastic modulus with strain was analyzed. The influences of moisture content, confining pressure and amplitude on the test results were explored. The results show that the deformation of compacted residual soil increased significantly as σd increased when the cumulative plastic strain reaches a certain value, but the final performance of deformation was elastic stability behavior. This characteristic decreased gradually with water content increasing. The increasing water content was not conducive to the deformation stability of the soil and the increasing confining pressure can inhibit the trend. In addition, the increasing water content would result in a quick damping of modulus and the decrease of residual modulus. The influence of confining pressure on the decay law of modulus decreased gradually with the strain increasing. This study may provide technical reference for the construction process of granite residual soil as embankment filling and soil conditioning.

Key words

granite residual soil / cyclic loading / moisture content / accumulated plastic deformation / dynamic elastic modulus.

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YIN Song 1, KONG Ling-wei 1, YANG Ai-Wu2, MU Kun1, WANG Tao2. Experimental Study on Dynamic Deformation of Residual Soil under Cyclic Loading[J]. Journal of Vibration and Shock, 2017, 36(11): 224-231

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